// Detects commands executed and prints them.
function OnGUI() {
    var e : Event = Event.current;
    if(e.commandName != "") {
        Debug.Log("Command recognized: " + e.commandName);    
    }    
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void OnGUI() {
        Event e = Event.current;
        if (e.commandName != "")
            Debug.Log("Command recognized: " + e.commandName);
        
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def OnGUI():
        e as Event = Event.current
        if e.commandName != '':
            Debug.Log(('Command recognized: ' + e.commandName))